Abstract: A nursing undergarment having an inner breast cup that is attached, to an undergarment structure along a lower cup portion and releasably attachable to the undergarment structure along an upper cup portion, combined, with an outer cover having an upper cover portion attached to the upper cup portion and releasably fastenable to the undergarment structure along a lower cover portion. The attached upper cup and cover top portions may be released from the undergarment structure to allow insertion of a breast pump flange through an opening in the inner breast cup, and the lower cover portion may be released from the undergarment structure to allow the flange to protrude outward. During nursing, the upper cup and cover top portions are fastened to the undergarment structure and the lower cover portion is released and raised to provide access to the nipple through the opening.